Peripheral Cutaneous Innvervation

Question 1

What is the difference between dermatomes and peripheral cutaneous nerve innervation?

Answer 1

Dermatomes are areas supplied by just one spinal nerve.

Peripheral cutaneous nerves tend to arise from several spinal nerves so tend to supply overlapping areas of dermatomes.

Question 2

What spinal nerve roots supply the posterior part of the neck’s peripheral cutaneous innervation?

Answer 2

Posterior rami of C2-C8

Question 3

Where is the nerve point of the neck?

Answer 3

Just above midpoint of posterior border of sternocleidomastoid

Question 4

What sensory branch of the cervical plexus comes from the C2 nerve root and supplies peripheral cutaneous innervation behind the ear?

Answer 4

Lesser occipital

Question 5

What sensory branch of the cervical plexus comes from the C2,C3 nerve roots and supplies peripheral cutaneous innervation of the bottom of and below the ear?

Answer 5

Great auricular nerve

Question 6

What sensory branch of the cervical plexus comes from the C2,C3 nerve roots and supplies peripheral cutaneous innervation of the front of the neck?

Answer 6

Transverse cervical

Question 7

What sensory branch of the cervical plexus comes from the C3,C4 nerve roots and supplies peripheral cutaneous innervation of the side of the neck?

Answer 7

Supraclavicular nerves

Question 8

What peripheral cutaneous nerve is associated with diaphragmatic pain being felt in the shoulder?

Answer 8

Supraclavicular nerves

Question 9

What nerves supply peripheral cutaneous innervation to the upper anterolateral trunk wall?

Answer 9

intercostal nerves

Question 10

What nerve supplies peripheral cutaneous innervation of the level below the T12 and what spinal nerve root does it come from?

Answer 10

• subcostal nerve

- from anterior ramus of T12

Question 11

What nerves supply peripheral cutaneous innervation of the lower anterolateral trunk wall and what spinal nerve root do they come from?

Answer 11

• iliohypogastric and ilioinguinal nerves

- bifurcation of anterior ramus of L1

Question 12

What nerve supplies the badge patch and what nerve roots does it come from?

Answer 12

• axillary nerve

- C5, C6

Question 13

What nerve supplies the inner elbow and outer lower arm and what nerve roots does it come from?

Answer 13

• cutaneous branch musculocutaneous nerve

- C5, C6, C7

Question 14

What nerve supplies the anatomical snuffbox and back of the hand and what nerve roots does it come from?

Answer 14

• radial nerve
• anatomical snuffbox by cutaneous branches of radial nerve
• (C5), C6, C7, C8, (T1)

Question 15

What nerve supplies the thumb, first and second fingers and what nerve roots does it come from?

Answer 15

• median nerve

- (C5), C6, C7, C8, T1

Question 16

What nerve supplies the fourth and little fingers and what nerve roots does it come from?

Answer 16

• ulnar nerve

- (C5), C8, T1

Question 17

What nerve supplies the armpit and inner arm and what nerve roots does it come from? and what is significant about this?

Answer 17

• T1 and T2 anterior rami

- referred pain from myocardium

Question 18

What nerve supplies the inner inguinal region and what nerve root does it come from?

Answer 18

• ilioguinal nerve

- L1

Question 19

What nerve supplies the middle inguinal region and what nerve roots does it come from?

Answer 19

• genitofemoral nerve

- L1, L2

Question 20

What nerve supplies the lateral upper thigh and what nerve roots does it come from?

Answer 20

• lateral cutaneous nerve of thigh nerve

- L2, L3

Question 21

What nerve supplies the anterior thigh and knee and what nerve roots does it come from?

Answer 21

• femoral nerve

- L2, L3, L4

Question 22

What nerve supplies the medial upper thigh and what nerve roots does it come from?

Answer 22

• Obturator nerve

- L2, L3, L4

Question 23

What nerve supplies the anterior shin and what nerve roots does it come from?

Answer 23

• Saphenous nerve

- from femoral: L3, L4

Question 24

What nerve supplies the lateral lower leg and what nerve roots does it come from?

Answer 24

• Sural nerve

- from tibial & common fibular: S1, S2

Question 25

What nerve supplies the top of the foot and what nerve roots does it come from?

Answer 25

• superficial fibular nerve

- L4, L5, S1

Question 26

What nerve supplies in between the 1st and 2nd toes and what nerve root does it come from?

Answer 26

• deep fibular nerve

- L5

Question 27

What nerve supplies the upper posterior thigh and what nerve roots does it come from?

Answer 27

-posterior rami of S1, S2 and S3

Question 28

What nerve supplies the posterior thigh and what nerve roots does it come from?

Answer 28

• posterior cutaneous nerve of thigh

- S1, S2, S3

Question 29

What are the 3 branches that come from the tibial nerve and what areas of the foot do they supply?

Answer 29

• calcaneal nerves supply heel
• medial plantar nerve supplies medial bottom of foot
• lateral plantar nerve supplies lateral edge of foot

Question 30

What are the spinal nerve roots of the tibial nerve?

Answer 30

L4, L5, S1, S2, S3